From 4e4383ffa2b9ec94e703ecbd6178737fc24f6866 Mon Sep 17 00:00:00 2001
From: Luuk van Baal <luukvbaal@gmail.com>
Date: Fri, 28 Apr 2023 16:22:42 +0200
Subject: vim-patch:9.0.1247: divide by zero with 'smoothscroll' set and a
 narrow window

Problem:    Divide by zero with 'smoothscroll' set and a narrow window.
Solution:   Bail out when the window is too narrow.

https://github.com/vim/vim/commit/870219c58c0804bdc55419b2e455c06ac715a835

Co-authored-by: Bram Moolenaar <Bram@vim.org>
---
 test/old/testdir/test_scroll_opt.vim | 27 +++++++++++++++++++++++++++
 1 file changed, 27 insertions(+)

(limited to 'test/old')

diff --git a/test/old/testdir/test_scroll_opt.vim b/test/old/testdir/test_scroll_opt.vim
index 3c95c36b4f..4ed54591af 100644
--- a/test/old/testdir/test_scroll_opt.vim
+++ b/test/old/testdir/test_scroll_opt.vim
@@ -577,5 +577,32 @@ func Test_smoothscroll_mouse_pos()
   "let &ttymouse = save_ttymouse
 endfunc
 
+" this was dividing by zero
+func Test_smoothscrol_zero_width()
+  CheckScreendump
+
+  let lines =<< trim END
+      winsize 0 0
+      vsplit
+      vsplit
+      vsplit
+      vsplit
+      vsplit
+      sil norm H
+      set wrap
+      set smoothscroll
+      set number
+  END
+  call writefile(lines, 'XSmoothScrollZero', 'D')
+  let buf = RunVimInTerminal('-u NONE -i NONE -n -m -X -Z -e -s -S XSmoothScrollZero', #{rows: 6, cols: 60, wait_for_ruler: 0})
+  call TermWait(buf, 3000)
+  call VerifyScreenDump(buf, 'Test_smoothscroll_zero_1', {})
+
+  call term_sendkeys(buf, ":sil norm \<C-V>\<C-W>\<C-V>\<C-N>\<CR>")
+  call VerifyScreenDump(buf, 'Test_smoothscroll_zero_2', {})
+
+  call StopVimInTerminal(buf)
+endfunc
+
 
 " vim: shiftwidth=2 sts=2 expandtab
-- 
cgit